Communication method and apparatus in a wireless communication system supporting multiple OFDM parameter sets

ABSTRACT

Communication methods and apparatuses in a wireless communication system are provided. Information relating to Orthogonal Frequency Division Multiplexing (OFDM) parameter sets supported by a Base Station (BS), from among a plurality of OFDM parameter sets, is transmitted to at least one Mobile Station (MS), from the BS, using a default OFDM parameter set. The BS selects at least one OFDM parameter set for the at least one MS, from among the OFDM parameter sets supported by the BS, based on one of a channel state and a mobility of the at least one MS. The BS performs data communication with the at least one MS through the at least one selected OFDM parameter set. Each of the plurality of OFDM parameter sets comprises parameter values representing a Cyclic Prefix (CP) length, a subcarrier spacing, and at least one of an Inverse Fast Fourier Transform (IFFT) size and Fast Fourier Transform (FFT) size. The default OFDM parameter set is determined based on subcarrier spacings of the plurality of OFDM parameter sets.

PRIORITY

The present application is a Continuation application of U.S. patentapplication Ser. No. 13/594,370, filed in the U.S. Patent and TrademarkOffice on Aug. 24, 2012, which claims priority under 35 U.S.C. §119(a)to Korean Patent Application Serial No. 10-2011-0085042, filed in theKorean Intellectual Property Office on Aug. 25, 2011, the entiredisclosures of which are hereby incorporated by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to a wireless communicationsystem, and more particularly, to a communication method and apparatusin a wireless communication system supporting multiple OrthogonalFrequency Division Multiplexing (OFDM) parameter sets.

2. Description of the Related Art

In traditional OFDM/Orthogonal Frequency Division Multiple Access(OFDMA) systems, one set of OFDM parameters, for example, one CyclicPrefix (CP) length, one subcarrier spacing, and one Fast FourierTransform (FFT) size, is supported within one cell. The system informsMobile Stations (MSs) about its OFDM configuration via a broadcastchannel.

However, MSs within one cell may have different mobility conditions,from being static to highly mobile. For each mobility type, there is aset of OFDM parameters that is best suitable.

When an operator or a user wants to select only one subcarrier spacing,the subcarrier spacing should support mobility. Thus, when the singlesubcarrier spacing is used, the selected subcarrier spacing is muchlarger than is actually needed for low mobility. Further, the largersubcarrier spacing results in increased overhead due to an enlargedsymbol duration.

SUMMARY OF THE INVENTION

The present invention is designed to address the above-discusseddeficiencies of the prior art, and to provide at least the advantagesdescribed below.

An aspect of the present invention is to provide a communication systemthat supports multiple OFDM parameter sets in order to optimize systemperformance.

Another aspect of the present invention is to provide a method and anapparatus for communicating in a communication system that supportsmultiple OFDM parameter sets.

In accordance with an aspect of the present invention, a communicationmethod of a Base Station (BS) in a wireless communication system isprovided. Information relating to OFDM parameter sets supported by theBS, from among a plurality of OFDM parameter sets, is transmitted to atleast one MS, from the BS, using a default OFDM parameter set. The BSselects at least one OFDM parameter set for the at least one MS, fromamong the OFDM parameter sets supported by the BS, based on one of achannel state and a mobility of the at least one MS. The BS performsdata communication with the at least one MS through the at least oneselected OFDM parameter set. Each of the plurality of OFDM parametersets comprises parameter values representing a CP length, a subcarrierspacing, and at least one of an Inverse Fast Fourier Transform (IFFT)size and FFT size. The default OFDM parameter set is determined based onsubcarrier spacings of the plurality of OFDM parameter sets.

In accordance with another aspect of the present invention, acommunication method of an MS in a wireless communication system isprovided. The MS receives, from a BS, information relating to OFDMparameter sets supported by the BS, from among a plurality of OFDMparameter sets, using a default OFDM parameter set. The MS performs datacommunication with the BS through at least one OFDM parameter setselected from the OFDM parameter sets supported by the BS based on oneof a channel state and a mobility of the MS. Each of the plurality ofOFDM parameter sets comprises parameter values representing a CP length,a subcarrier spacing, and at least one of an IFFT size and FFT size. Thedefault OFDM parameter set is determined based on subcarrier spacings ofthe plurality of OFDM parameter sets.

In accordance with another aspect of the present invention, acommunication apparatus of a BS in a wireless communication system isprovided. The communication apparatus includes a controller configuredto select OFDM parameter sets supported by the BS, from among aplurality of OFDM parameter sets communicated via a default OFDMparameter set, and select at least one OFDM parameter set for at leastone MS, from among the OFDM parameter sets supported by the BS, based onone of a channel state and a mobility of the at least one MS. Thecommunication apparatus also includes a transceiver configured totransmit, to the at least one MS, information relating to the OFDMparameter sets supported by the BS, using the default OFDM parameterset, and perform data communication with the at least one MS through theat least one OFDM parameter set. Each of the plurality of OFDM parametersets comprises parameter values representing a CP length, a subcarrierspacing, and at least one of an IFFT size and FFT size. The default OFDMparameter set is determined based on subcarrier spacings of theplurality of OFDM parameter sets.

In accordance with another aspect of the present invention, acommunication apparatus of a MS in a wireless communication system isprovided. The communication apparatus includes a controller configuredto determine OFDM parameter sets supported by a BS from among aplurality of OFDM parameter sets as communicated via a default OFDMparameter set transmitted by the BS, and select at least one OFDMparameter set from among the plurality of OFDM parameter sets based onone of a channel state and a mobility of the MS. The communicationapparatus also includes a transceiver configured to receive, from theBS, the default OFDM parameter set, and perform data communication withthe BS through the at least one OFDM parameter set. Each of theplurality of OFDM parameter sets comprises parameter values representinga CP length, a subcarrier spacing, and at least one of an IFFT size andFFT size. The default OFDM parameter set is determined based onsubcarrier spacings of the plurality of OFDM parameter sets.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features, and advantages of certainembodiments of the present invention will be more apparent from thefollowing description taken in conjunction with the accompanyingdrawings, in which:

FIG. 1 is a flowchart illustrating BS operations for communicating in awireless communication system supporting multiple OFDM parameter setsaccording to an embodiment of the present invention;

FIG. 2 is a flowchart illustrating MS operations for communicating in awireless communication system supporting multiple OFDM parameter setsaccording to an embodiment of the present invention;

FIG. 3 is a flowchart illustrating BS operations for communicating in awireless communication system supporting multiple OFDM parameter setsaccording to an embodiment of the present invention;

FIG. 4 is a flowchart illustrating MS operations for communicating in awireless communication system supporting multiple OFDM parameter setsaccording to an embodiment of the present invention; and

FIG. 5 is a block diagram illustrating a transmitting apparatus forcommunicating in a wireless communication system supporting multipleOFDM parameter sets according to an embodiment of the present invention.

Throughout the drawings, like reference numerals will be understood torefer to like parts, components, and structures.

DETAILED DESCRIPTION OF EMBODIMENTS OF THE PRESENT INVENTION

Various embodiments of the present invention are described in detailbelow with reference to the accompanying drawings to assist in acomprehensive understanding of these embodiments of the presentinvention. Although the following description includes various specificdetails to assist in that understanding, these are to be regarded asmerely exemplary. Accordingly, those of ordinary skill in the art willrecognize that various changes and modifications of the embodimentsdescribed herein can be made without departing from the scope and spiritof the invention. In addition, descriptions of well-known functions andconstructions may be omitted for clarity and conciseness.

The terms and words used in the following description and claims are notlimited to the dictionary meanings, but, are merely used to enable aclear and consistent understanding of the invention.

In accordance with an embodiment of the present invention, a method andan apparatus are provided for communication in a wireless communicationsystem supporting multiple OFDM parameter sets.

Herein, a millimeter Wave (mmWave) is classified as electromagneticspectrum that spans between 30 GHz to 300 GHz, corresponding towavelengths from 10 mm to 1 mm.

In Cellular Millimeter Wave (CMW) communication systems, it is feasibleto deploy multiple sets of OFDM parameters in each cell, to efficientlyutilize spectrum resources. That is, CMW communication systems feature abeam transmission (tx) that allows different sets of OFDM parameters fordifferent users.

More specifically, in the CMW communication systems, a BS transmits asignal to an MS using a beamforming scheme for better link quality.Generally, the beamwidth is small (e.g., 10 degrees). Accordingly, themost suitable multiple access scheme is Time Division Multiple Access(TDMA). In each time slot, the BS transmits a signal to one MS using onebeam. For different users, different OFDM parameters can be used tomaximize DownLink (DL) throughput.

FIG. 1 is a flowchart illustrating BS operations for communicating in awireless communication system supporting multiple OFDM parameter setsaccording to an embodiment of the present invention.

Referring to FIG. 1, the BS determines multiple OFDM parameter sets instep 100. For example, the BS may determine multiple OFDM parameter setsusing a table, such as Table 1 below.

Further, the multiple OFDM parameter sets can be determined by anoperator or by the BS by collecting and using statistical data ofchannel condition or statistical data of the MS mobility. One OFDMparameter set includes a Fast Fourier Transform (FFT) size, a CyclicPrefix (CP) length, a subcarrier spacing, and a symbol duration, whereeach is mapped to one IDentifier (ID).

TABLE 1 Nominal channel bandwidth, BW (MHz) 5 7 8.75 10 20 Samplingrate, n 28/25 8/7 8/7 28/25 28/25 Sampling frequency, F_(s) (MHz) 5.6 810 11.2 22.4 FFT size, N_(FFT) 512 1024 1024 1024 2048 Subcarrierspacing, Δ f (kHz) 10.94 7.81 9.77 10.94 10.94 Useful symbol time, T_(b)(μs) 91.4 128 102.4 91.4 91.4 CP ratio, G = 1/8 OFDMA symbol time,102.857 144 115.4 102.857 102.857 T_(s) (μs) FDD Number of OFDMA 48 3443 48 48 symbols per 5 ms frame Idle time (μs) 62.857 104 46.40 62.85762.857 TDD Number of OFDMA 47 33 42 47 47 symbols per 5 ms frame TTG +RTG (μs) 165.714 248 161.6 165.714 165.714

In step 102, the BS determines a default DL OFDM parameter set from themultiple OFDM parameter sets. The default DL OFDM parameter set isdetermined as the OFDM parameter set having the greatest subcarrierspacing among the multiple OFDM parameter sets. While the OFDM parameterset of the greatest subcarrier spacing increases overhead, i.e.,decreases the symbol duration for the data transmission, the OFDMparameter set of the greatest subcarrier spacing will support all of theMSs.

In step 104, using the default DL OFDM parameter set, the BS providesinformation of the supportable OFDM parameter sets (e.g., OFDM parameterset IDs) to the MS. For example, the BS can broadcast the information ofthe supportable OFDM parameter sets to every MS in its cell using thedefault OFDM parameter set. Therefore, the information of the OFDMparameter sets supported by the BS can be included in basic capabilitysupport negotiation during network entry. Accordingly, both the MS andthe BS can determine the OFDM parameter set to use by exchanging thesupported OFDM parameter sets in the network entry.

In step 106, the BS determines OFDM parameter sets for the MSs and OFDMparameter sets for Radio Frequency (RF) chains of the MSs based on themobility or the channel condition of the MS. For example, when the BSprovides only one beam to one MS, the one MS includes only one RF chain.Therefore, one OFDM parameter set is applied to one MS or one RF chain.

Alternatively, when the BS provides multiple beams to one MS, the one MSincludes multiple RF chains, i.e., one RF chain for each beam. Thus,multiple OFDM parameter sets are applied to the one MS and thecorresponding OFDM parameter sets are respectively applied to the RFchains.

In step 108, the BS determines whether to change the OFDM parameter set,based on the mobility or the channel condition of the MS, whichcontinuously varies over time. For example, the BS can determine whetherto change the OFDM parameter set, based on DL channel measurement suchas delay spread and Doppler spread or the MS mobility.

When the BS does not need to change the OFDM parameter set, operationscontinue with the same OFDM parameter set until a change is required.

When the BS determines to change the OFDM parameter set in step 108, theBS unicasts information of the changed OFDM parameter set to the MS instep 110.

In step 112, the BS communicates with the MS based on the changed OFDMparameter set.

FIG. 2 is a flowchart illustrating MS operations for communicating in awireless communication system supporting multiple OFDM parameter setsaccording to an embodiment of the present invention.

Referring to FIG. 2, in step 202, the MS determines multiple OFDMparameter sets, e.g., using Table 1. The multiple parameter sets can bedetermined by the operator or by the MS by collecting and using thestatistical data of the channel condition or the statistical data of themoving speed.

In step 204, the MS determines a default UpLink (UL) OFDM parameter setfrom the multiple OFDM parameter sets. The default UL OFDM parameter setis determined as the OFDM parameter set having the greatest subcarrierspacing among the multiple OFDM parameter sets. Again, while the OFDMparameter set of the greatest subcarrier spacing increases the overhead,the OFDM parameter set of the greatest subcarrier spacing can besupported by all of the MSs.

The default DL OFDM parameter set of the BS can be the same as ordifferent from the default UL OFDM parameter set of the MS.

In step 206, using the default UL OFDM parameter set, the MS obtains theinformation of the supportable OFDM parameter sets of the BS from theBS. For example, the MS receives the information of the supportable OFDMparameter sets of the BS over a broadcast channel using the default ULOFDM parameter set. Therefore, the information of the OFDM parametersets supported by the BS can be included in the basic capability supportnegotiation during the network entry. Accordingly, both the MS and theBS can exchange the supported OFDM parameter sets in the network entry.

In step 208, the MS communicates with the BS by configuring the OFDMparameter sets for one or multiple RF chains based on the obtained OFDMparameter set information.

In step 210, the MS determines if information for an OFDM parameter setchange is received from the BS.

When no information for an OFDM parameter set change is received fromthe BS, operations continue with the same OFDM parameter set until achange is required.

When information for an OFDM parameter set change is received from theBS, the MS communicates with the BS using the changed OFDM parameter setin step 212.

FIG. 3 is a flowchart illustrating BS operations for communicating in awireless communication system supporting multiple OFDM parameter setsaccording to an embodiment of the present invention.

Referring to FIG. 3, in step 300, the BS determines multiple OFDMparameter sets, e.g., using Table 1. The multiple OFDM parameter setscan be determined by the operator or by the BS by collecting and usingthe statistical data of the channel condition or the statistical data ofthe MS mobility. One OFDM parameter set can include the FFT size, the CPlength, the subcarrier spacing, and the symbol duration, where each ismapped to one ID.

In step 302, the BS determines a default DL OFDM parameter set from themultiple OFDM parameter sets. The default DL OFDM parameter set isdetermined as the OFDM parameter set having the greatest subcarrierspacing among the multiple OFDM parameter sets. While the OFDM parameterset of the greatest subcarrier spacing increases the overhead, the OFDMparameter set of the greatest subcarrier spacing can support all of theMSs.

In step 304, using the default DL OFDM parameter set, the BS providesinformation of the supportable OFDM parameter sets (e.g., OFDM parameterset IDs) to the MS. For example, the BS can broadcast the information ofits supportable OFDM parameter sets to every MS in its cell using thedefault DL OFDM parameter set. Therefore, the information of the OFDMparameter sets supported by the BS can be included in the basiccapability support negotiation during the network entry. Accordingly,both the MS and the BS can exchange their supported OFDM parameter setsin the network entry.

In step 306, the BS determines OFDM parameter sets for the MSs and OFDMparameter sets for RF chains of the MSs based on the mobility or thechannel condition of the MS. For example, when the BS provides only onebeam to one MS, the one MS includes only one RF chain. Therefore, oneOFDM parameter set is applied to one MS or one RF chain.

Alternatively, when the BS provides multiple beams to one MS, the one MSincludes multiple RF chains, i.e., one RF chain for each beam.Accordingly, the multiple OFDM parameter sets are applied to the one MSand the corresponding OFDM parameter sets are respectively applied tothe multiple RF chains.

In step 308, the BS determines whether an OFDM parameter set changerequest is received from the MS.

When the BS does not receive an OFDM parameter set change request fromthe MS, operations continue with the same OFDM parameter set until achange is required.

When receiving an OFDM parameter set change request from the MS in step308, the BS determines and responds with the OFDM parameter set to beused by the MS in step 310.

In step 312, the BS communicates with the MS using the changed OFDMparameter set.

FIG. 4 is a flowchart illustrating MS operations for communicating in awireless communication system supporting multiple OFDM parameter setsaccording to an embodiment of the present invention.

Referring to FIG. 4, in step 400, the MS determines multiple OFDMparameter sets, e.g., using Table 1. The multiple parameter sets can bedetermined by the operator or by the MS by collecting and using thestatistical data of the channel condition or the statistical data of themoving speed.

In step 402, the MS determines a default UL OFDM parameter set from themultiple OFDM parameter sets. The default UL OFDM parameter set isdetermined as the OFDM parameter set having the greatest subcarrierspacing among the multiple OFDM parameter sets. While the OFDM parameterset of the greatest subcarrier spacing increases the overhead, the OFDMparameter set of the greatest subcarrier spacing can be supported by allof the MSs.

Additionally, the default DL OFDM parameter set of the BS can be thesame as or different from the default UL OFDM parameter set of the MS.

In step 404, using the default UL OFDM parameter set, the MS obtains theinformation of the supportable OFDM parameter sets of the BS from theBS. For example, the MS receives the information of the supportable OFDMparameter sets of the BS using the default UL OFDM parameter set.Therefore, the information of the OFDM parameter sets supported by theBS can be included in the basic capability support negotiation duringthe network entry. Accordingly, both the MS and the BS can exchange thesupported OFDM parameter sets in the network entry.

In step 406, the MS communicates with the BS by configuring the OFDMparameter sets for one or multiple RF chains based on the obtained OFDMparameter set information.

If necessary, the MS sends the OFDM parameter set change request messageto the BS in step 408, and then receives changed OFDM parameter setinformation from the BS.

In step 410, the MS communicates with the BS using the changed OFDMparameter set.

FIG. 5 is a block diagram illustrating a transmitting apparatus forcommunicating in a wireless communication system supporting multipleOFDM parameter sets according to an embodiment of the present invention.Specifically, the transmitting apparatus in FIG. 5 may be included inthe BS or the MS.

Referring to FIG. 5, the transmitting apparatus includes a controller500, first through N-th channel coders 501-1 through 502-N, firstthrough N-th modulators 504-1 through 504-N, first through N-th InverseFFT (IFFT) units 506-1 through 506-N, first through N-th serial/parallelconverters 508-1 through 508-N, first through N-th CP inserters 510-1through 510-N, first through N-th digital/analog converters 512-1through 512-N, first through N-th beamformers 520_1 through 520_N, firstthrough N_(T) adders 530_1 through 530_N_(T), and a plurality ofantennas 540_1 through 540_N_(T).

The controller 500, e.g., a protocol controller, controls the operationsof the transmitting apparatus. The controller 500 provides informationfor the protocol processing to a corresponding component of a physicallayer, or issues a control signal to the corresponding component of thephysical layer.

In addition, the controller 500 determines the OFDM parameter sets toapply to the respective RF chains and applies an OFDM parameter value ofthe corresponding OFDM parameter set to the corresponding component.

For example, a first RF chain includes the first channel coder 502-1,the first modulator 504-1, the first IFFT unit 506-1, the firstserial/parallel converter 508-1, the first CP inserter 510-1, and thefirst digital/analog converter 512-1. Likewise, an N-th RF chainincludes the N-th channel coder 502-n, the N-th modulator 504-N, theN-th IFFT unit 506-N, the N-th serial/parallel converter 508-N, the N-thCP inserter 510-N, and the N-th digital/analog converter 512-N. Thecorresponding RF chain is a process chain for forming the beam of thecorresponding MS. One MS and one RF chain can be mapped, or one MS andmultiple RF chains can be mapped. That is, the controller 500 determinesthe mapping of the MS and one or more RF chains through scheduling.

The RF chains can be divided logically or physically. That is, hardwareof the channel coder, the modulator, the IFFT unit, the serial/parallelconverter, the CP inserter, and the digital/analog converter, can beprovided for each RF chain, or the multiple RF chains can be logicallyconfigured in the single transmitter including the channel coder, themodulator, the IFFT unit, the first serial/parallel converter, the firstCP inserter, and the digital/analog converter.

The first through N-th channel coders 501-1 through 502-N receivecontrol information bits or data information bits from the controller505, apply a preset coding scheme to the bits, and output the coded bitsto the first through N-th modulators 504-1 through 504-N. For example,the coding scheme utilizes turbo coding or convolutional coding.

The first through N-th modulators 504-1 through 504-N modulate the codedbits output from the first through N-th channel coders 501-1 through502-N, to symbols using a preset modulation scheme, and output themodulated symbols to the first through N-th IFFT units 506-1 through506-N. For example, the modulation scheme utilizes Quadrature PhaseShift Keying (QPSK) or 16 Quadrature Amplitude Modulation (QAM).

The first through N-th IFFT units 506-1 through 506-N apply N-point IFFTto the modulated symbols output from the first through N-th modulators504-1 through 504-N, and output the symbols to the first through N-thserial/parallel converters 508-1 through 508-N. The IFFT size of each RFchain is determined by the controller 500.

The first through N-th serial/parallel converters 508-1 through 508-Nserial/parallel convert the signals output from the first through N-thIFFT units 506-1 through 506-N, and output the converted signals to thefirst through N-th CP inserters 510-1 through 510-N. The first throughN-th CP inserters 510-1 through 510-N insert a guard interval signal tothe signals output from the first through N-th serial/parallelconverters 508-1 through 508-N and output the signals to the firstthrough N-th digital/analog converters 512-1 through 512-N.

Herein, the guard interval is inserted to remove interference betweenthe OFDM symbol transmitted in a previous OFDM symbol time and a currentOFDM symbol to transmit in the current OFDM symbol time when the OFDMsymbols are transmitted in the OFDM communication system. The CP lengthof each RF chain is determined by the controller 500.

The first through N-th digital/analog converters 512-1 through 512-Nconvert the signals output from the first through N-th CP inserters510-1 through 510-N, to analog signals.

The output signals of the first through N-th digital/analog converters512-1 through 512-N are RF-processed by components such as filters (notshown) and front end units (not shown) to be transmittable over the air,and then fed to an antenna stage.

The antenna stage includes the beamformers 520_1 to 520_N, the adders530_1 to 530_N_(T), and the antennas 540_1 to 540_N_(T). N_(T) indicatesthe number of transmit antenna. The beamformers 520 form beamstransmitted in a particular direction by controlling phase and amplitudeof multiple antenna elements. The adders 530 combine the RF signals ofthe multiple RF chains and outputs the added signals to thecorresponding transmit antennas 540.

Each RF chain is connected to part or all of the transmit antennas anduses analog beamforming to enhance signal quality.

As described above, the system performance can be optimized bysupporting the multiple OFDM parameter sets in the wirelesscommunication system.

While the present invention has been shown and described with referenceto certain embodiments thereof, it will be understood by those skilledin the art that various changes in form and details may be made thereinwithout departing from the spirit and scope of the present invention asdefined by the appended claims and their equivalents.

What is claimed is:
 1. A communication method of a Base Station (BS) ina wireless communication system, the communication method comprising thesteps of: transmitting, to at least one Mobile Station (MS), from theBS, information relating to Orthogonal Frequency Division Multiplexing(OFDM) parameter sets supported by the BS, from among a plurality ofOFDM parameter sets, using a default OFDM parameter set; selecting, bythe BS, at least one OFDM parameter set for the at least one MS, fromamong the OFDM parameter sets supported by the BS, based on one of achannel state and a mobility of the at least one MS; and performing, bythe BS, data communication with the at least one MS through the at leastone selected OFDM parameter set, wherein each of the plurality of OFDMparameter sets comprises parameter values representing a Cyclic Prefix(CP) length, a subcarrier spacing, and at least one of an Inverse FastFourier Transform (IFFT) size and Fast Fourier Transform (FFT) size, andwherein the default OFDM parameter set is determined based on subcarrierspacings of the plurality of OFDM parameter sets.
 2. The communicationmethod of claim 1, wherein the default OFDM parameter set has a largestsubcarrier spacing among the subcarrier spacings of the plurality ofOFDM parameter sets.
 3. The communication method of claim 1, whereintransmitting the information relating to the OFDM parameter setssupported by the BS comprises: broadcasting the information relating tothe OFDM parameter sets supported by the BS over a broadcast channel tothe at least one MS.
 4. The communication method of claim 1, whereintransmitting the information relating to the OFDM parameter setssupported by the BS comprises: transmitting the information relating tothe OFDM parameter sets supported by the BS to the at least one MSthrough a basic capability support negotiation during network entry. 5.The communication method of claim 1, wherein selecting the at least oneOFDM parameter set comprises: if the at least one MS includes aplurality of Radio Frequency (RF) chains, selecting multiple OFDMparameter sets for the at least one MS, each of the multiple OFDMparameter sets corresponding to a respective one of the plurality of RFchains; and if the at least one MS includes one RF chain, selecting oneOFDM parameter set for the at least one MS.
 6. The communication methodof claim 1, further comprising: determining whether a change of an OFDMparameter set is necessary, based on one of the channel state and themobility of the at least one MS; and transmitting, to the at least oneMS, information relating to a changed OFDM parameter set.
 7. Thecommunication method of claim 1, further comprising: receiving an OFDMparameter set change request from the at least one MS; determining achanged OFDM parameter set to be used by the at least one MS; andtransmitting the changed OFDM parameter set to the at least one MS.
 8. Acommunication method of a Mobile Station (MS) in a wirelesscommunication system, the communication method comprising: receiving,from a Base Station (BS), at the MS, information relating to OrthogonalFrequency Division Multiplexing (OFDM) parameter sets supported by theBS, from among a plurality of OFDM parameter sets, using a default OFDMparameter set; and performing, by the MS, data communication with the BSthrough at least one OFDM parameter set selected from the OFDM parametersets supported by the BS based on one of a channel state and a mobilityof the MS, wherein each of the plurality of OFDM parameter setscomprises parameter values representing a Cyclic Prefix (CP) length, asubcarrier spacing, and at least one of an Inverse Fast FourierTransform (IFFT) size and Fast Fourier Transform (FFT) size, and whereinthe default OFDM parameter set is determined based on subcarrierspacings of the plurality of OFDM parameter sets.
 9. The communicationmethod of claim 8, wherein the default OFDM parameter set has a largestsubcarrier spacing among the subcarrier spacings of the plurality ofOFDM parameter sets.
 10. The communication method of claim 8, whereinreceiving the information relating to the OFDM parameter sets supportedby the BS comprises: receiving, from the BS, the information relating tothe OFDM parameter sets supported by the BS over a broadcast channel.11. The communication method of claim 8, wherein receiving theinformation relating to the OFDM parameter sets supported by the BScomprises: receiving, from the BS, the information relating to the OFDMparameter sets supported by the BS through a basic capability supportnegotiation during network entry.
 12. The communication method of claim8, further comprising selecting the at least one OFDM parameter set fromamong the OFDM parameter sets supported by the BS, wherein selecting theat least one OFDM parameter set comprises: if the MS includes aplurality of Radio Frequency (RF) chains, selecting multiple OFDMparameter sets from among the OFDM parameter sets supported by the BS,each of the multiple OFDM parameter sets corresponding to a respectiveone of the plurality of RF chains; and if the MS includes one RF chain,selecting one OFDM parameter set from among the OFDM parameter setssupported by the BS.
 13. The communication method of claim 8, furthercomprising: receiving, from the BS, information relating to a changedOFDM parameter set; and communicating with the BS through the changedOFDM parameter set.
 14. The communication method of claim 8, furthercomprising: transmitting an OFDM parameter set change request to the BS;receiving, from the BS, information relating to a changed OFDM parameterset; and communicating with the BS through the changed OFDM parameterset.
 15. A communication apparatus of a Base Station (BS) in a wirelesscommunication system, the communication apparatus comprising: acontroller configured to select Orthogonal Frequency DivisionMultiplexing (OFDM) parameter sets supported by the BS, from among aplurality of OFDM parameter sets communicated via a default OFDMparameter set, and select at least one OFDM parameter set for at leastone Mobile Station (MS), from among the OFDM parameter sets supported bythe BS, based on one of a channel state and a mobility of the at leastone MS; and a transceiver configured to transmit, to the at least oneMS, information relating to the OFDM parameter sets supported by the BS,using the default OFDM parameter set, and perform data communicationwith the at least one MS through the at least one OFDM parameter set,wherein each of the plurality of OFDM parameter sets comprises parametervalues representing a Cyclic Prefix (CP) length, a subcarrier spacing,and at least one of an Inverse Fast Fourier Transform (IFFT) size andFast Fourier Transform (FFT) size, and wherein the default OFDMparameter set is determined based on subcarrier spacings of theplurality of OFDM parameter sets.
 16. The communication apparatus ofclaim 15, wherein the default OFDM parameter set has a largestsubcarrier spacing among the subcarrier spacings of the plurality ofOFDM parameter sets.
 17. The communication apparatus of claim 15,wherein the transceiver is further configured to transmit theinformation relating to the OFDM parameter sets supported by the BS tothe at least one MS by broadcasting the information relating to the OFDMparameter sets supported by the BS over a broadcast channel.
 18. Thecommunication apparatus of claim 15, wherein the transceiver is furtherconfigured to transmit the information relating to the OFDM parametersets supported by the BS to the at least one MS by transmitting theinformation relating to the OFDM parameter sets supported by the BS tothe at least one MS through a basic capability support negotiationduring network entry.
 19. The communication apparatus of claim 15,wherein the controller is further configured to: if the at least one MSincludes a plurality of Radio Frequency (RF) chains, select multipleOFDM parameter sets for the at least one MS, each of the multiple OFDMparameter sets corresponding to a respective one of the plurality of RFchains; and if the at least one MS includes one RF chain, select oneOFDM parameter set for the at least one MS.
 20. The communicationapparatus of claim 15, wherein: the controller is further configured todetermine whether a change of an OFDM parameter set is necessary, basedon one of the channel state and the mobility of the at least one MS; andthe transceiver is further configured to transmit, to the at least oneMS, information relating to a changed OFDM parameter set.
 21. Thecommunication apparatus of claim 15, wherein the transceiver is furtherconfigured to receive an OFDM parameter set change request from the atleast one MS; the controller is further configured to determine achanged OFDM parameter set to be used by the at least one MS; and thetransceiver is further configured to transmit the changed OFDM parameterset to the at least one MS.
 22. A communication apparatus of a MobileStation (MS) in a wireless communication system, the communicationapparatus comprising: a controller configured to determine OrthogonalFrequency Division Multiplexing (OFDM) parameter sets supported by aBase Station (BS) from among a plurality of OFDM parameter sets ascommunicated via a default OFDM parameter set transmitted by the BS, andselect at least one OFDM parameter set from among the plurality of OFDMparameter sets based on one of a channel state and a mobility of the MS;and a transceiver configured to receive, from the BS, the default OFDMparameter set, and perform data communication with the BS through the atleast one OFDM parameter set, wherein each of the plurality of OFDMparameter sets comprises parameter values representing a Cyclic Prefix(CP) length, a subcarrier spacing, and at least one of an Inverse FastFourier Transform (IFFT) size and Fast Fourier Transform (FFT) size, andwherein the default OFDM parameter set is determined based on subcarrierspacings of the plurality of OFDM parameter sets.
 23. The communicationapparatus of claim 22, wherein the default OFDM parameter set has alargest subcarrier spacing among the subcarrier spacings of theplurality of OFDM parameter sets.
 24. The communication apparatus ofclaim 22, wherein the transceiver is further configured to receiveinformation relating to the OFDM parameter sets supported by the BS fromthe BS over a broadcast channel.
 25. The communication apparatus ofclaim 22, wherein the transceiver is further configured to receiveinformation relating to the OFDM parameter sets supported by the BS fromthe BS through a basic capability support negotiation during networkentry.
 26. The communication apparatus of claim 22, wherein thecontroller is further configured to: if the MS includes a plurality ofRadio Frequency (RF) chains, select multiple OFDM parameter sets fromamong the OFDM parameter sets supported by the BS, each of the multipleOFDM parameter sets corresponding to a respective one of the pluralityof RF chains; and if the MS includes one RF chain, select one OFDMparameter set from among the OFDM parameter sets supported by the BS.27. The communication apparatus of claim 22, wherein the transceiver isfurther configured to: receive, from the BS, information relating to achanged OFDM parameter set; and communicate with the BS through thechanged OFDM parameter set.
 28. The communication apparatus of claim 22,wherein the transceiver is further configured to: transmit an OFDMparameter set change request to the BS; receive, from the BS,information relating to a changed OFDM parameter set; and communicatewith the BS through the changed OFDM parameter set.